Orbit Fit and Astrometric record for 17BK229

The following information shows the result of the orbit fit based on Gary Bernstein's method. Most of the information should be self-explanatory. Take special note that while the original Bernstein software works with barycentric coordinates, we convert these results into a heliocentric coordinate system.

# Object: 17BK229   
# Created Tue Apr  1 01:11:00 2025
# Orbit generated from Bernstein formalism
# Fitting     98 observations of     99
# Arc:   2.01y
# First observation: 2016/01/15
#  Last observation: 2018/01/17
Preliminary a, adot, b, bdot, g, gdot:
  -0.000006   0.017957  -0.000002  -0.000464   0.020804   0.000000
# Chi-squared of fit:    84.01 DOF:    190 RMS:  0.16
# Min/Max residuals:    -0.53    0.44
# Exact a, adot, b, bdot, g, gdot:
  1.295425E-05  1.793631E-02 -1.323182E-07 -4.634182E-04  2.080135E-02  1.009630E-04
# Covariance matrix:
  4.8542E-13 -7.4153E-13 -8.5275E-15  1.4465E-14 -3.7526E-13 -1.3931E-11
 -7.4153E-13  1.4785E-12  2.2023E-14 -3.4034E-14  9.9496E-13  3.3047E-11
 -8.5275E-15  2.2023E-14  2.4261E-13 -2.0394E-13  1.8066E-14  5.5467E-13
  1.4465E-14 -3.4034E-14 -2.0394E-13  1.8285E-13 -2.5472E-14 -8.7111E-13
 -3.7526E-13  9.9496E-13  1.8066E-14 -2.5472E-14  8.3520E-13  2.4951E-11
 -1.3931E-11  3.3047E-11  5.5467E-13 -8.7111E-13  2.4951E-11  8.4463E-10
#      lat0       lon0       xBary       yBary       zBary        JD0
   -9.983206  151.238790    0.589382   -0.136311   -0.775415  2457403.107207
# Heliocentric elements and errors
Epoch:              2457400.5000  =  2016/01/13
Mean Anomaly:          186.23978 +/-     1.137
Argument of Peri:       75.40444 +/-     1.138
Long of Asc Node:      249.87832 +/-     0.008
Inclination:             9.95117 +/-     0.000
Eccentricity:         0.07459468 +/-    0.0002
Semi-Major Axis:     45.48028422 +/-    0.0031
Time of Perihelion: 2511473.5724 +/-     353.7
Perihelion:          42.08769700 +/-    0.0090
Aphelion:            48.87287143 +/-    0.0092
Period (y)              306.7206 +/-      0.03
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -41.91559437 +/-    0.0018
Ecliptic Y           23.67440732 +/-    0.0010
Ecliptic Z           -8.33407370 +/-    0.0004
Ecliptic XDOT        -0.00113881 +/-    0.0000
Ecliptic YDOT        -0.00207524 +/-    0.0000
Ecliptic ZDOT        -0.00006235 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   48.85541319 +/-    0.0016
Geocenter to KBO     48.07379996 +/-    0.0021
# Hcoef:  7.84

The following table shows the complete astrometric record for 17BK229. The first three columns show the date of observation. The next six columns are RA and DEC. The next column (when provided) is the observed magnitude and filter. The next column is the object name (17BK229) followed by the observatory code and reference code for the source of the astrometry.

2016 01  15.606418 09 58 57.22   +01 41 13.8   23.6z 17BK229   T09  C~7uj7      
2016 01  15.641081 09 58 57.09   +01 41 14.4         17BK229   T09  C~7uj7      
2016 01  15.668933 09 58 57.01   +01 41 14.7         17BK229   T09  C~7uj7      
2016 12  25.51821  10 03 41.68   +01 16 31.9   25.3r 17BK229   T09  C~7uj7      
2016 12  25.54616  10 03 41.64   +01 16 31.9   25.1r 17BK229   T09  C~7uj7      
2016 12  25.59402  10 03 41.50   +01 16 32.1   25.1i 17BK229   T09  C~7uj7      
2017 01  21.41782  10 02 24.42   +01 19 21.1   24.4z 17BK229   T09  C~7uj7      
2017 01  21.44099  10 02 24.35   +01 19 21.3   24.0z 17BK229   T09  C~7uj7      
2017 01  21.45826  10 02 24.28   +01 19 21.6   24.6z 17BK229   T09  C~7uj7      
2017 01  21.48580  10 02 24.20   +01 19 21.8   24.1z 17BK229   T09  C~7uj7      
2017 01  21.51187  10 02 24.10   +01 19 21.9   24.5z 17BK229   T09  C~7uj7      
2017 01  21.53790  10 02 24.01   +01 19 22.4   24.0z 17BK229   T09  C~7uj7      
2017 01  21.57598  10 02 23.88   +01 19 22.9   25.3z 17BK229   T09  C~7uj7      
2017 01  23.36273  10 02 17.49   +01 19 45.9   24.8r 17BK229   T09  C~7uj7      
2017 01  23.39642  10 02 17.35   +01 19 46.3   24.8r 17BK229   T09  C~7uj7      
2017 01  23.41024  10 02 17.31   +01 19 46.8   24.5r 17BK229   T09  C~7uj7      
2017 01  23.52068  10 02 16.90   +01 19 47.9   24.2i 17BK229   T09  C~7uj7      
2017 01  23.56169  10 02 16.76   +01 19 48.6   24.0i 17BK229   T09  C~7uj7      
2017 01  23.59193  10 02 16.65   +01 19 48.9   24.3i 17BK229   T09  C~7uj7      
2017 01  30.43912  10 01 51.08   +01 21 30.3   24.4i 17BK229   T09  C~7uj7      
2017 01  30.46126  10 01 50.99   +01 21 30.5   24.3i 17BK229   T09  C~7uj7      
2017 01  30.50547  10 01 50.82   +01 21 31.1   23.9z 17BK229   T09  C~7uj7      
2017 01  30.56834  10 01 50.57   +01 21 32.3   24.3z 17BK229   T09  C~7uj7      
2017 01  30.59415  10 01 50.48   +01 21 32.7   24.1z 17BK229   T09  C~7uj7      
2017 02  01.34504  10 01 43.74   +01 22 00.9   25.0g 17BK229   T09  C~7uj7      
2017 02  01.35930  10 01 43.67   +01 22 02.1   25.3g 17BK229   T09  C~7uj7      
2017 02  01.41992  10 01 43.40   +01 22 02.9   25.7g 17BK229   T09  C~7uj7      
2017 02  01.44869  10 01 43.31   +01 22 03.6   25.7g 17BK229   T09  C~7uj7      
2017 02  21.32404  10 00 23.51   +01 28 38.9   24.6z 17BK229   T09  C~7uj7      
2017 02  21.33504  10 00 23.48   +01 28 39.3   23.9z 17BK229   T09  C~7uj7      
2017 02  21.33887  10 00 23.46   +01 28 39.3   24.5z 17BK229   T09  C~7uj7      
2017 02  21.34959  10 00 23.41   +01 28 39.5   24.5z 17BK229   T09  C~7uj7      
2017 02  21.36441  10 00 23.37   +01 28 39.8   24.6z 17BK229   T09  C~7uj7      
2017 02  21.37870  10 00 23.30   +01 28 40.1   23.8z 17BK229   T09  C~7uj7      
2017 02  21.38235  10 00 23.29   +01 28 40.1   24.1z 17BK229   T09  C~7uj7      
2017 02  21.38619  10 00 23.27   +01 28 40.1   24.4z 17BK229   T09  C~7uj7      
2017 02  21.40442  10 00 23.19   +01 28 40.8   24.2z 17BK229   T09  C~7uj7      
2017 02  21.41191  10 00 23.15   +01 28 41.1   24.4z 17BK229   T09  C~7uj7      
2017 02  21.42282  10 00 23.09   +01 28 41.3   24.2z 17BK229   T09  C~7uj7      
2017 02  23.31993  10 00 15.47   +01 29 24.3   26.0g 17BK229   T09  C~7uj7      
2017 02  23.32237  10 00 15.44   +01 29 24.3   26.0g 17BK229   T09  C~7uj7      
2017 02  23.33356  10 00 15.40   +01 29 24.5   25.5g 17BK229   T09  C~7uj7      
2017 02  23.46720  10 00 14.83   +01 29 27.7   25.8r 17BK229   T09  C~7uj7      
2017 02  23.49694  10 00 14.73   +01 29 28.5   26.1r 17BK229   T09  C~7uj7      
2017 02  23.50008  10 00 14.72   +01 29 28.5   25.8r 17BK229   T09  C~7uj7      
2017 02  23.50391  10 00 14.70   +01 29 28.5   25.8r 17BK229   T09  C~7uj7      
2017 02  23.51193  10 00 14.66   +01 29 28.7   25.7r 17BK229   T09  C~7uj7      
2017 02  23.51437  10 00 14.66   +01 29 28.9   25.4r 17BK229   T09  C~7uj7      
2017 02  25.36128  10 00 07.21   +01 30 11.4   24.6i 17BK229   T09  C~7uj7      
2017 02  25.41253  10 00 07.02   +01 30 12.6   24.4i 17BK229   T09  C~7uj7      
2017 02  25.43124  10 00 06.95   +01 30 12.9   24.3i 17BK229   T09  C~7uj7      
2017 02  25.43480  10 00 06.95   +01 30 13.2   24.1i 17BK229   T09  C~7uj7      
2017 03  04.26703  09 59 39.95   +01 32 55.5   23.5z 17BK229   T09  C~7uj7      
2017 03  04.27420  09 59 39.89   +01 32 55.4   23.9z 17BK229   T09  C~7uj7      
2017 03  04.27802  09 59 39.90   +01 32 55.5   24.0z 17BK229   T09  C~7uj7      
2017 03  04.28185  09 59 39.89   +01 32 56.0   24.0z 17BK229   T09  C~7uj7      
2017 03  04.29255  09 59 39.81   +01 32 56.2   23.9z 17BK229   T09  C~7uj7      
2017 03  04.29967  09 59 39.80   +01 32 56.4   23.6z 17BK229   T09  C~7uj7      
2017 03  04.30350  09 59 39.78   +01 32 56.2   23.8z 17BK229   T09  C~7uj7      
2017 03  04.30733  09 59 39.78   +01 32 56.4   23.6z 17BK229   T09  C~7uj7      
2017 03  04.31803  09 59 39.73   +01 32 56.9   24.1z 17BK229   T09  C~7uj7      
2017 03  04.32520  09 59 39.70   +01 32 56.7   24.1z 17BK229   T09  C~7uj7      
2017 03  04.32902  09 59 39.68   +01 32 57.0   24.0z 17BK229   T09  C~7uj7      
2017 03  04.33285  09 59 39.68   +01 32 56.9   24.0z 17BK229   T09  C~7uj7      
2017 03  04.34360  09 59 39.61   +01 32 57.2   23.8z 17BK229   T09  C~7uj7      
2017 03  04.35080  09 59 39.61   +01 32 57.7   24.3z 17BK229   T09  C~7uj7      
2017 03  04.35463  09 59 39.59   +01 32 57.7   24.1z 17BK229   T09  C~7uj7      
2017 03  04.46328  09 59 39.16   +01 33 00.2   24.7i 17BK229   T09  C~7uj7      
2017 03  04.46710  09 59 39.15   +01 33 00.2   24.3i 17BK229   T09  C~7uj7      
2017 03  04.47782  09 59 39.08   +01 33 00.7   24.2i 17BK229   T09  C~7uj7      
2017 03  04.48885  09 59 39.04   +01 33 00.7   24.2i 17BK229   T09  C~7uj7      
2017 03  06.49634  09 59 31.30   +01 33 49.6   25.4r 17BK229   T09  C~7uj7      
2017 03  06.50449  09 59 31.28   +01 33 49.8   25.4r 17BK229   T09  C~7uj7      
2017 03  06.53219  09 59 31.17   +01 33 50.5   24.9r 17BK229   T09  C~7uj7      
2017 03  07.41426  09 59 27.81   +01 34 12.1   23.7y 17BK229   T09  C~83Ep      
2017 03  07.42363  09 59 27.77   +01 34 12.4   23.8y 17BK229   T09  C~83Ep      
2017 03  07.50339  09 59 27.51   +01 34 14.4   24.0y 17BK229   T09  C~83Ep      
2017 03  21.34535  09 58 38.02   +01 39 56.9   24.8y 17BK229   T09  C~7xTl      
2017 03  21.38387  09 58 37.88   +01 39 57.9   24.3y 17BK229   T09  C~7xTl      
2017 03  21.39557  09 58 37.84   +01 39 58.3   25.1y 17BK229   T09  C~7xTl      
2017 03  21.41085  09 58 37.79   +01 39 58.3   24.8y 17BK229   T09  C~7xTl      
2017 03  25.24634  09 58 25.48   +01 41 33.0   25.5r 17BK229   T09  C~7uj7      
2017 03  25.26003  09 58 25.45   +01 41 33.1   24.7r 17BK229   T09  C~7uj7      
2017 03  25.26562  09 58 25.42   +01 41 33.1   24.5r 17BK229   T09  C~7uj7      
2017 03  25.27375  09 58 25.40   +01 41 33.3   25.1r 17BK229   T09  C~7uj7      
2017 03  25.27935  09 58 25.36   +01 41 33.6   25.2r 17BK229   T09  C~7uj7      
2017 03  25.28747  09 58 25.36   +01 41 34.0   24.7r 17BK229   T09  C~7uj7      
2017 03  29.26967  09 58 13.34   +01 43 10.5   25.8g 17BK229   T09  C~8Q43      
2017 03  29.30574  09 58 13.24   +01 43 11.2   25.9g 17BK229   T09  C~8Q43      
2017 03  29.31142  09 58 13.21   +01 43 11.3   26.0g 17BK229   T09  C~8Q43      
2017 03  30.29005  09 58 10.42   +01 43 35.0   24.6i 17BK229   T09  C~8Q43      
2017 03  30.33530  09 58 10.26   +01 43 36.5   24.0y 17BK229   T09  C~8Q43      
2017 03  30.35826  09 58 10.22   +01 43 36.7   23.7y 17BK229   T09  C~8Q43      
2017 03  30.37378  09 58 10.15   +01 43 37.3   24.8y 17BK229   T09  C~8Q43      
2018 01  17.46122  10 06 28.33   +00 55 25.3   24.1i 17BK229   T09  C~7uj7      
2018 01  17.51028  10 06 28.16   +00 55 25.6   24.3i 17BK229   T09  C~7uj7      
2018 01  17.51830  10 06 28.10   +00 55 25.6   24.5i 17BK229   T09  C~7uj7      
2018 01  17.54536  10 06 28.04   +00 55 26.0   24.3i 17BK229   T09  C~7uj7      
2018 01  17.57223  10 06 27.94   +00 55 26.5   24.7i 17BK229   T09  C~7uj7      

The following table shows the residuals to the orbit fit. The first coumn is the point number. The second column is the time, in years, measured from the first observation. The third and fifth columns are the regularized positions used in the orbit fit. The fourth and sixth columns are the residuals, in arc seconds, for RA and Dec respectively.

     1   0.0000      0.00     0.14       0.00    -0.05
     2   0.0001     -2.04    -0.13      -0.12     0.13
     3   0.0002     -3.26     0.05      -0.25     0.22
     4   0.9443   4515.16     0.17     100.51    -0.15
     5   0.9444   4514.59     0.44     100.30    -0.04
     6   0.9445   4512.56    -0.16      99.75    -0.04
     7   1.0180   3370.01    -0.30    -145.68     0.02
     8   1.0180   3368.95    -0.08    -145.86     0.01
     9   1.0181   3367.87    -0.22    -145.95     0.04
    10   1.0182   3366.67     0.10    -146.18     0.01
    11   1.0182   3365.23     0.10    -146.61    -0.23
    12   1.0183   3363.79     0.10    -146.61    -0.05
    13   1.0184   3361.79     0.20    -146.82     0.02
    14   1.0233   3263.94     0.13    -158.74    -0.10
    15   1.0234   3261.83    -0.08    -159.10    -0.23
    16   1.0234   3261.10    -0.04    -158.84     0.12
    17   1.0237   3254.95     0.04    -159.95    -0.24
    18   1.0238   3252.74     0.15    -160.03    -0.04
    19   1.0239   3251.09     0.21    -160.33    -0.13
    20   1.0427   2856.28    -0.01    -199.21     0.11
    21   1.0427   2854.95    -0.01    -199.49    -0.06
    22   1.0428   2852.35     0.07    -199.82    -0.15
    23   1.0430   2848.42    -0.06    -200.00     0.00
    24   1.0431   2847.01     0.10    -200.10     0.04
    25   1.0479   2742.44     0.39    -208.96    -0.53
    26   1.0479   2741.04    -0.14    -208.21     0.29
    27   1.0481   2736.96    -0.49    -208.87    -0.07
    28   1.0482   2735.45    -0.24    -208.69     0.25
    29   1.1026   1475.97    -0.17    -255.98    -0.11
    30   1.1026   1475.41    -0.01    -255.76     0.11
    31   1.1026   1475.13    -0.04    -255.87     0.01
    32   1.1027   1474.36    -0.11    -255.94    -0.06
    33   1.1027   1473.69     0.20    -255.87     0.02
    34   1.1027   1472.60     0.05    -255.95    -0.06
    35   1.1027   1472.46     0.15    -256.01    -0.11
    36   1.1028   1472.18     0.12    -256.11    -0.22
    37   1.1028   1470.81    -0.05    -255.87     0.03
    38   1.1028   1470.14    -0.23    -255.80     0.11
    39   1.1029   1469.23    -0.42    -255.93    -0.02
    40   1.1080   1347.14     0.18    -255.51     0.15
    41   1.1081   1346.72    -0.08    -255.67    -0.01
    42   1.1081   1346.09     0.02    -255.69    -0.03
    43   1.1084   1336.96    -0.33    -255.67    -0.01
    44   1.1085   1335.28    -0.06    -255.45     0.21
    45   1.1085   1335.14     0.00    -255.50     0.16
    46   1.1085   1334.85    -0.03    -255.60     0.06
    47   1.1086   1334.22    -0.13    -255.63     0.03
    48   1.1086   1334.15    -0.04    -255.44     0.22
    49   1.1136   1214.63    -0.44    -254.60    -0.07
    50   1.1138   1211.54    -0.17    -254.47     0.03
    51   1.1138   1210.45    -0.03    -254.55    -0.06
    52   1.1138   1210.35     0.10    -254.27     0.22
    53   1.1325    774.29     0.27    -243.45     0.17
    54   1.1326    773.48    -0.08    -243.86    -0.25
    55   1.1326    773.59     0.27    -243.71    -0.12
    56   1.1326    773.28     0.20    -243.30     0.29
    57   1.1326    772.08    -0.31    -243.53     0.04
    58   1.1326    771.87    -0.07    -243.39     0.16
    59   1.1326    771.66    -0.03    -243.69    -0.14
    60   1.1327    771.59     0.14    -243.50     0.04
    61   1.1327    770.71    -0.05    -243.29     0.22
    62   1.1327    770.36     0.06    -243.64    -0.14
    63   1.1327    769.98    -0.08    -243.46     0.03
    64   1.1327    770.01     0.20    -243.55    -0.07
    65   1.1328    768.92    -0.21    -243.64    -0.17
    66   1.1328    768.75     0.08    -243.17     0.28
    67   1.1328    768.47     0.05    -243.27     0.17
    68   1.1331    761.55     0.09    -243.18     0.04
    69   1.1331    761.41     0.19    -243.23    -0.02
    70   1.1331    760.25    -0.28    -243.13     0.06
    71   1.1331    759.69    -0.14    -243.34    -0.17
    72   1.1386    633.86    -0.11    -238.01    -0.09
    73   1.1387    633.51     0.06    -237.93    -0.03
    74   1.1387    631.72     0.01    -237.85    -0.02
    75   1.1412    576.97     0.02    -235.18     0.01
    76   1.1412    576.30    -0.05    -235.11     0.06
    77   1.1414    571.95 (   0.61)   -234.60 (   0.36)
    78   1.1793   -242.97     0.15    -172.49     0.10
    79   1.1794   -245.28    -0.01    -172.29     0.09
    80   1.1794   -245.99    -0.06    -172.12     0.19
    81   1.1795   -246.69     0.10    -172.38    -0.15
    82   1.1900   -452.70    -0.07    -148.01     0.12
    83   1.1900   -453.16     0.20    -148.07    -0.03
    84   1.1900   -453.58     0.08    -148.23    -0.23
    85   1.1901   -453.93     0.16    -148.15    -0.19
    86   1.1901   -454.60    -0.21    -148.07    -0.16
    87   1.1901   -454.73     0.08    -147.70     0.17
    88   1.2010   -657.30    -0.01    -120.12    -0.12
    89   1.2011   -658.95     0.16    -119.98    -0.24
    90   1.2011   -659.40    -0.01    -120.05    -0.34
    91   1.2038   -706.87     0.32    -112.42    -0.01
    92   1.2039   -709.64    -0.21    -111.85     0.24
    93   1.2040   -710.28     0.29    -111.88     0.05
    94   1.2040   -711.47    -0.13    -111.68     0.13
    95   2.0064   7301.82     0.13    -212.97     0.24
    96   2.0066   7299.32     0.15    -213.58     0.02
    97   2.0066   7298.48    -0.28    -213.90    -0.23
    98   2.0067   7297.50     0.13    -213.84     0.05
    99   2.0068   7295.91    -0.07    -213.89     0.21

The following table comes from a 10My integration of the orbit of the object. Three columns are shown. The first column is the result of integrating the nominal orbit. The other two columns are based on clones of the nominal orbit that are +/- 3 sigma from the nominal orbit. If all three types agree then the classificiation is deemed secure. The basis for these calculations is described in more detail in AJ, 129, 1117 (2005). Any use made of these calculations should refer to and credit this publication and the Deep Ecliptic Survey Team.

17BK229    quality flag:3

Type:      CLASSICAL CLASSICAL CLASSICAL

axisobj        45.219    45.228    45.211
ecceobj         0.081     0.081     0.082
incobj          9.938     9.938     9.938
qmin           40.951    40.977    40.920
qmax           49.811    49.894    49.848
amean          45.273    45.281    45.264
amin           44.901    44.934    44.905
amax           45.653    45.675    45.646
emean           0.080     0.080     0.080
emin            0.069     0.068     0.069
emax            0.092     0.093     0.093
imean          11.512    11.511    11.513
imin           11.143    11.143    11.142
imax           11.888    11.884    11.891
excite_mean     0.215     0.215     0.215
fracstop        1.000     1.000     1.000
cjmean          3.060     3.060     3.060

libcent 0      -180.0    -180.0    -180.0
libamp  0      -180.0    -180.0    -180.0
libcent 1      -180.0    -180.0    -180.0
libamp  1      -180.0    -180.0    -180.0
libcent 2      -180.0    -180.0    -180.0
libamp  2      -180.0    -180.0    -180.0
libcent 3      -180.0    -180.0    -180.0
libamp  3      -180.0    -180.0    -180.0
libcent 4      -180.0    -180.0    -180.0
libamp  4      -180.0    -180.0    -180.0

kozaimean       177.4     177.7     177.9
kozaiamp        180.0     180.0     180.0